Feat/plugin support, allow third_party feat(spine) to create plugin for creator.

[Tianze-Chen]

Re: #

Changelog

---

Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

---

Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

[Tianze-Chen]

@cocos-robot run test cases

[github-actions]

Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1015436 bytes	1018274 bytes	⚠️ +2838 bytes
2D All (legacy pipeline)	2683233 bytes	2686084 bytes	⚠️ +2851 bytes
2D All (new pipeline)	2775492 bytes	2778338 bytes	⚠️ +2846 bytes
(2D + 3D) All	10032934 bytes	10036178 bytes	⚠️ +3244 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16869352 bytes	16872406 bytes	⚠️ +3054 bytes

Interface Check Report

! WARNING this pull request has changed these public interfaces:

@@ -2681,8 +2681,61 @@
         protected _applyFontTexture(): void;
         protected changeMaterialForDefine(): void;
     }
     /**
+     * @en A segment of the mesh: a range of indices drawn with one texture+material.
+     * @zh 网格的一个片段：一段索引，用同一纹理+材质绘制。
+     */
+    export interface UIMeshSegment {
+        indexOffset: number;
+        indexCount: number;
+        texture: Texture2D | null;
+        material: renderer.MaterialInstance | null;
+    }
+    /**
+     * @en Pre-baked mesh data for one frame.
+     * @zh 一帧的预烘焙网格数据。
+     * vertexStride: 24 (single-color V3F_T2F_C4B) or 28 (two-color V3F_T2F_C4B_C4B).
+     */
+    export interface UIMeshData {
+        vertexCount: number;
+        vertexStride: number;
+        vertexData: Uint8Array;
+        indexCount: number;
+        indexData: Uint8Array;
+        segments: UIMeshSegment[];
+    }
+    /**
+     * @en A generic 2D mesh renderer that consumes pre-baked vertex/index data.
+     * The data provider (e.g. a spine plugin) fills setMeshData every frame; this
+     * component handles buffer allocation, batching and submission.
+     * @zh 通用 2D 网格渲染器，消费预烘焙的顶点/索引数据。数据提供方（如 spine 插件）
+     * 每帧调用 setMeshData，本组件负责缓冲分配、合批与提交。
+     */
+    export class UIMesh extends UIRenderer {
+        protected _enableBatch: boolean;
+        protected _meshData: UIMeshData | null;
+        protected _useTint: boolean;
+        protected _accessor: __private._cocos_2d_renderer_static_vb_accessor__StaticVBAccessor | null;
+        protected _tintAccessor: __private._cocos_2d_renderer_static_vb_accessor__StaticVBAccessor | null;
+        constructor();
+        /**
+         * @en Feeds the pre-baked mesh data for the current frame.
+         * @zh 喂入当前帧的预烘焙网格数据。
+         */
+        setMeshData(data: UIMeshData): void;
+        /**
+         * @en Whether to enable sprite batching.
+         * @zh 是否启用合批。
+         */
+        get enableBatch(): boolean;
+        set enableBatch(value: boolean);
+        protected _flushAssembler(): void;
+        updateRenderer(): void;
+        protected _render(batcher: any): void;
+        protected createRenderEntity(): __private._cocos_2d_renderer_render_entity__RenderEntity;
+    }
+    /**
      * @en
      * The Mask Component.
      *
      * @zh
@@ -61334,8 +61387,34 @@
         stop(): void;
     }
     /**
      * @en
+     * The engine's packaged cross-platform WebAssembly interface (pal/wasm).
+     *
+     * Re-exported under the public `cc.wasm` namespace so extension/game code can
+     * load its own `.wasm` files through the same platform-adaptive path the engine
+     * uses internally for box2d / physx / spine / webgpu:
+     *
+     *   - web:      fetch the `.wasm` bytes, then `WebAssembly.instantiate`;
+     *   - mini-game: resolve the path into `cocos-js/` and delegate to the platform's
+     *               `CCWebAssembly.instantiate` (which accepts a file path, never
+     *               raw bytes — this is why embedded-base64 wasm fails there);
+     *   - native:   read the file from `src/cocos-js/` via `fileUtils`.
+     *
+     * The `wasmUrl` argument is a bare file name (e.g. `'foo.wasm'`) whose file is
+     * expected to land in the build output's `cocos-js/` directory.
+     * @zh
+     * 引擎封装好的跨平台 WebAssembly 接口（pal/wasm），通过 `cc.wasm` 命名空间公开，
+     * 供扩展/游戏代码用与引擎内部一致的路径加载自己的 `.wasm`。
+     */
+    export const wasm: {
+        instantiateWasm: typeof __private._pal_wasm__instantiateWasm;
+        fetchBuffer: typeof __private._pal_wasm__fetchBuffer;
+        fetchUrl: typeof __private._pal_wasm__fetchUrl;
+        ensureWasmModuleReady: typeof __private._pal_wasm__ensureWasmModuleReady;
+    };
+    /**
+     * @en
      * WebView component, used to display web pages in the game.
      * Since different platforms have different authorizations, APIs, and control methods for WebView components, there is no unified standard yet.
      * So currently only Web, iOS, and Android platforms are supported.
      * @zh
@@ -75998,8 +76077,33 @@
             enable(): void;
             disable(noPause?: boolean): void;
             syncMatrix(): void;
         }
+        /**
+         * The first parameter of standard `Webassembly.instantiate` interface is the arraybuffer of wasm.
+         * But the implementation on some platforms is not standard.
+         * So here we provide a more commonly used interface, whose first parameter is the url of wasm.
+         *
+         * @param wasmUrl the url of wasm, this should be a url relative from build output chunk.
+         * @param importObject the standard `WebAssembly.Imports` instance
+         */
+        export function _pal_wasm__instantiateWasm(wasmUrl: string, importObject: WebAssembly.Imports): Promise<WebAssembly.WebAssemblyInstantiatedSource>;
+        /**
+         * Fetch binary data from wasm url or js mem url.
+         * NOTE: This method should only use to instantiate asm.js compiled with `-O2` options,
+         * because not all platforms support instantiate wasm by wasm binary.
+         * eg. WeChat can only instantiate wasm by wasm url.
+         *
+         * @param binaryUrl the url of wasm or js mem, this should be a url relative from build output chunk.
+         */
+        export function _pal_wasm__fetchBuffer(binaryUrl: string): Promise<ArrayBuffer>;
+        export function _pal_wasm__fetchUrl(binaryUrl: string): Promise<string>;
+        /**
+         * Sometimes we need to put wasm modules in subpackage to reduce code size.
+         * In this case we need to ensure that the wasm modules is ready before we import them.
+         * Please remember to invoke this method before we import wasm modules.
+         */
+        export function _pal_wasm__ensureWasmModuleReady(): Promise<void>;
         export enum _cocos_web_view_web_view_enums__WebViewEventType {
             /**
              * @en None.
              * @zh 无。

[github-actions]

@Tianze-Chen, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v4.0.0
• Task Result: FAIL
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/9085ad25-6161-4814-9071-7b3a3c1abaeb/-1
• GitHub Action: https://github.com/cocos/cocos4/actions/runs/32715612479

Task Details

Platform	build	boot	runned	crashScene	FailScene
web-mobile	PASS	PASS	FAIL		graphics-line-join
ios	PASS	PASS	PASS
mac	PASS	PASS	PASS

[github-actions]

@Tianze-Chen, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v4.0.0
• Task Result: PASS
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/089860d8-b139-44d8-83f5-0f82c30ee3ca/-1
• GitHub Action: https://github.com/cocos/cocos4/actions/runs/32715612479

Task Details